I am looking for a battery for my fifth wheel. I guess it is called a "house battery". For the purpose of running my 12V system in the event power fails or for not being connected to a post. My pri...
If you stick with the basic & the cheapest, group 24 wet cell, you will always be tied to the post.
As a few have suggested cram as many amp hours in the space available as you can. That will likely be only a pair of GC batteries or maybe a pair of group 27 12Vs if you are lucky.
You might be able to do a single 4D case sized 12V.
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